ABSTRACT

Vehicle overweighting has been one of the key driving forces of deteriorated pavements. The overweighting characteristics that dominate the pavement performance deterioration have been inadequately investigated. This study filled such a gap by analyzing the survival time of pavement under different overweighting scenarios. The survival model was based on the accelerated failure time (AFT) formulation. For improved predictivity, an implementation of the AFT using the gradient boosting tree method was employed. All data concerned were collected from the Long-Term Pavement Performance (LTPP) program. Fatigue cracking and rutting were selected as the pavement performance indicators. Each indicator had three levels of failure thresholds to investigate the impact of overweighting on short-term, mid-term, and long-term pavement performance. The predictive performance of AFT models showed that long-term pavement performance was more dependent on overweighting than short-term pavement performance. Compared with the volume and weight of overweight vehicles, the overweighting percentage described the overweighting situation the best. Fatigue cracking was more sensitive to the overweighting percentage than rutting. Without overweighting, the average pavement fatigue life and rutting life would be extended by about 43% and 29%, respectively.

摘要

车辆超重一直是路面恶化的主要驱动力之一。主导路面性能恶化的超重特性尚未得到充分研究。本研究通过分析不同超载情况下路面的生存时间填补了这一空白。生存模型基于加速故障时间 (AFT) 公式。为了提高预测性，采用了使用梯度提升树方法的 AFT 实现。所有相关数据均来自长期路面性能 (LTPP) 计划。选择疲劳开裂和车辙作为路面性能指标。每个指标都有三个级别的失败阈值，以调查超重对短期、中期和长期路面性能的影响。AFT 模型的预测性能表明，长期路面性能比短期路面性能更依赖于超重。与超重车辆的体积和重量相比，超重百分比最能描述超重情况。疲劳开裂比车辙对超重百分比更敏感。在不超重的情况下，平均路面疲劳寿命和车辙寿命将分别延长约 43% 和 29%。疲劳开裂比车辙对超重百分比更敏感。在不超重的情况下，平均路面疲劳寿命和车辙寿命将分别延长约 43% 和 29%。疲劳开裂比车辙对超重百分比更敏感。在不超重的情况下，平均路面疲劳寿命和车辙寿命将分别延长约 43% 和 29%。